It’s understood they were advised to go to hospital but returned home to use eye baths.

Officers said they ‘could easily’ have suffered life-changing injuries as they issued an urgent appeal for witnesses or anyone with information to come forward.

The victims, believed to be a couple, were walking near the Aldi supermarket on Ashton Old Road in Openshaw at around 8.10pm on Friday. Police said a car drove past and bleach was thrown from a window.

A GMP spokesman said: “The bleach hit them in the eyes and caused severe discomfort however luckily it is not believed there will be any lasting damage.”